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G. RICHARDSON. MACHINE GLoGK.

No. 75,196. Patented Mar. 3. 1-868.

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GEOBGE RICHARDSON, OF LOWELL, MASSACHUSETTS.

Letters Patent No. 75,196, dated llfarch 3, 1868.

IMPROVEMENT In moms-omens.

Gite ,Srtnimis' lrfttrth in in the: items 33mm: mm mating pntt nf fig: 5mm.

TO ALL WHOM IT MAY CONCERN:

Be it known that I, Gnonen Rlclmnnsolv, of Lowell, in the county of Middlesex, and-State of Massachueetts, have invented new and useful Improvements in Machine-Clocks;- and I do h'ereby declare that the following is afull and exact description thereof,,referen.ce being had to the accompanying drawings, and to the letters of reference marked thereon.

The nature-of my invention consists in providinga machine-clock, with its entire mechanism enclosed in a case or shell, consisting of the requisitezdiii'erential or reducing gears; the object of which is, when the motion from any given inachine or vehicle is imparted to the clock, by a. worm attached to the driving-shaft, it will-ht sight accurately indicate. the amount of revolutions or work performed.

To ennble others skilled in the art to make and use my invention, Iwill proceed to describe its construction and operation.

Figure 1 represents a plan of my improved machine-clock.

Figure 2 represents a vertical section of the same.

Figure 3 represents a plan of the case or shell, with the pinion i and shaft h in position.

Figure 4 represents a plan of the travelling-gear Figure 5 represents a plan of the under side of the dial-plate, showing the internal gear 11.

Figure 6 represents a plan of the top of the internal revolving gear 7:, with its pinion I.

Figure 7 represents a plan of the travelling-gear m.

Figure 8 represents a plan of the internal revolving gear k.

In the difierent figures the same letters refer to identical parts.

a represents .the case or shell, its outside being round, its inside being formed with a partition or division, I), suiiicient above the bottom to receive and enclose the worm-gear c flush and even with the bottom. Above this partition I), and east with the case a, are the internal gears cl and e, also the projectionsfand 9. Through the centre of this partition 6 a hole or hearing is made for the reception of the shaft .1, to which the worm-gear c is cast on The shaft h'being placed in the bearing, the pinion i is placed on and over the shaft It, close down to the partition b, and firmly secured to the shaft 7:. The travelling-gear j is then placed down on to the partition I), its teeth connecting orgearing into the pinion i the full length of the teeth, and connecting or gearing into the stationary internal geardone-half the length'of teeth. The internal revolving gear k, with its pinion Zattnched', is. then placed, with its finished bearing through its centre, over and on to the shaft k, the ends of the teeth resting on the stationary internal gear d, and connecting or gearing into the pinionjf The travellinggear m is then placed on the upper or top surface of the plate of the internal gear is, its teeth gearing into and connecting with the pinion lthe full length of the teeth,.and with the stationary internal gear e one-half the length. The dial-plate being finished and marked off as desired on the one side, and finished hearing through the centre, on its under side is attached or cast on, the internal gear 12, which is then placed over and on the shaft it, its teeth gearing into the travelling-gear m,'and is heldin its place by the sprcw o. On one side of the case a is attached the pointer or finger I. On its opposite side a recess, is cut into the case a sufficient for the reception of a worm or the first driver which intersects with the gear a. From the shnit to which the worm or first driver is attached motion is imparted. The clock being thus prepared and secured to the required machine, receiving its motion from a worm connecting with the worm-gear c, this imparts motion to the pinion i, which is fastened to the shaft it, this gives motion to the travelling-genrj, the'gear j connecting with the internal revolving gear I: and the internalstationery gear d. The gear is having one tooth more or less than the gear d, gains or moves one tooth only While the travelling-gear j is traversing the entire circumference of the gear d.- This imparts reduced motion to the travelling-gear m rom' the pinion Z,'comn'-.unieating with the internal dial-gear n, which dial-gear n, having one tooth, more or less, than the internal'stntionary gear e, the gear m has to traverse the entire circumference of thestctionary gear e to gain or move the dial-gear it one tooth In order to illustrate the operation and results here obtained moreelearly, I will proceed to explain. The

. worm-gear c to have sixty-three teeth, thepinion i eight teeth, the stationary internal gear dtwentysix teeth, the internal revolving gear 7c twenty-five teeth, the pinion l nine'tceth, the stationary internal gear 2 thirtythree teeth, and the internal gear a thirty-two teeth. In order to ascertain the number of revolutions-the pinion 1 makes in moving the gear it one tooth,- by dividing the stationary gear (2 by the pinion i and adding the ratio of one tooth, that being the difl'erence of teeth between the gears k and d. lhen, by multiplying the number of revolutions that the pinion makes in moving the gear I: one tooth by the number of teethin the gear 7:, that product will be the number of rovolutionsthat the pinion i has to make while the gear It makes one; thus: 26-:- =3.25+:1=4.25X25=106.25. Then, to ascertain the number of revolutions the pinion Z will make while the revolving gear 12 is making one, the same rule is applied; thus: 33 :9=3.66+1=4.66X32=149.12. These two prodnctsmultiplied into each other will give the number of revolutions the pinion i will make while the dial makes one; thus: 106.25X149.12=1 5844.0000. This product being multiplied bythe number of teeth in the worm-gear 0, will give the number of revolutions that the worm or worm-shaft makes while the dial makes one; thus:.15844.0000X63=998172.

I do not corifine myself to any particular number of teeth the stationary gears d and e have, as similar results \i'ould be obtained if these gears d and e have an indefinite number of teeth, more or less than the revolving gears k and l. This augmented reduced motion ,being communiczied to the dial, the pointer 11, being fixed or stationary to the case a, accurately and positively indicates, by aid of the figures on the dial-face, at sight, the amount of revolu'tions'or.workperformed at any given period of time. I prefer a stationary finger, P, fastened to the case a, for the reason the figures on the dial, passing under the finger P, are always exposed to the view of the observer in their natural position, although the same .resultscan. be accomplished by a stationary dial and a movable finger. By continuing and increasing the sets of gears, this'principle of progressive reduction in speed can be carried out to such an extent that the revolutions of the worm .or first driver may be almost infinite to one revolution of the dial.

What I claim asmy invention, and desireto secure bylLetters Patent, is'- I The application of the stationary internal gears (Z and a, travelling-gears j and n, and pinions i and Z, when arranged to operate substantially ns'described and for the purposes fully set forth.

GEORGE RICHARDSON,- Witnesses:

Gno. E. Pevnr, Amen Pevsr. 

